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(C) RSA Hash Binary Data and Sign (and Verify)Demonstrates how to sign the hash of binary data. Also demonstrates how to verify the RSA signature. Note: This example uses methods introduced in Chilkat v9.5.0.77.
#include <C_CkPrivateKey.h> #include <C_CkRsa.h> #include <C_CkBinData.h> #include <C_CkPublicKey.h> void ChilkatSample(void) { HCkPrivateKey privKey; BOOL success; HCkRsa rsa; const char *originalData; HCkBinData bdData; HCkBinData bdSignature; HCkPublicKey pubKey; HCkRsa rsa2; BOOL bVerified; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Load an RSA private key for signing. privKey = CkPrivateKey_Create(); success = CkPrivateKey_LoadEncryptedPemFile(privKey,"qa_data/pem/rsa_passwd.pem","passwd"); if (success != TRUE) { printf("%s\n",CkPrivateKey_lastErrorText(privKey)); CkPrivateKey_Dispose(privKey); return; } rsa = CkRsa_Create(); CkRsa_ImportPrivateKeyObj(rsa,privKey); // We have some binary data (in hex) to sign originalData = "0102030405060708090A"; bdData = CkBinData_Create(); CkBinData_AppendEncoded(bdData,originalData,"hex"); // Hash (SHA-256) and sign the hash: bdSignature = CkBinData_Create(); success = CkRsa_SignBd(rsa,bdData,"sha256",bdSignature); if (success != TRUE) { printf("%s\n",CkRsa_lastErrorText(rsa)); CkPrivateKey_Dispose(privKey); CkRsa_Dispose(rsa); CkBinData_Dispose(bdData); CkBinData_Dispose(bdSignature); return; } // Show the RSA signature in base64 printf("%s\n",CkBinData_getEncoded(bdSignature,"base64")); // ------------------------------------------ // Get the public key from the private key pubKey = CkPrivateKey_GetPublicKey(privKey); // Verify the signature.. rsa2 = CkRsa_Create(); CkRsa_ImportPublicKeyObj(rsa2,pubKey); bVerified = CkRsa_VerifyBd(rsa2,bdData,"sha256",bdSignature); printf("signature verified: %d\n",bVerified); CkPublicKey_Dispose(pubKey); CkPrivateKey_Dispose(privKey); CkRsa_Dispose(rsa); CkBinData_Dispose(bdData); CkBinData_Dispose(bdSignature); CkRsa_Dispose(rsa2); } |
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